Improvement in machinery for molding for metal castings



UNITED Srafrus Barnum Ottica.

DAVID BROWN, OF BALTIMORE, MARYLAND, ASSIGNOR TO J. F. CLARK AND D.BROWN.

IMPROVEMENT IN MACHINERY FOR MOLDING FOR METAL CASTINGS.

Specification forming part of Letters Patent No. l LMU dated June 27,1854.

To @ZZ whom, it may concern:

Be it known that I, DAvID BROWN, of the city and county of Baltimore,and State of Maryland, have invented a new and useful Improvement inMachines for Forming Molds, l specially adapted to molds for castingpipes;

-an d I do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming a part of the specification, of Which- Figure 1 is afrontgelevation ofthe machine complete; Fig. 2, a section through theline A B of Fig. l; Fig. 3, a section throughO D of Fig. 2, and Fig. 4.-is a strike-board.

The nature of my invention consists in so arranging the several portionsof the mechanism that the sand contained in a chamber or piston-boxshall be moved therein by a pattern, and a piston-plate surrounding saidpattern, and thus made to protrude from the pistonbox and to enter ahalf-flask, by which means the sand at the parting is more compressedthan at the central portion of the half-mold, while on the face of themold it is sufficiently so to insure good castings.

To enable others skilled in the art to make and use my improvement, Iwill describe it as follows:

In Figure l A A is the stand; B, a iiywheel, D, the main spur-wheel onthe main shaft. E E are the jointed eccentric pistonrods;,F, the mainbrace through which the piston-rods work. G, Fig. 1, is the piston. A Sis the piston-box, permanently fastened to the top of the stand A A bystrong iron plates. His the half-flask in `which the mold is formed, andT T are swivels in the ends of the liask. M M are caps secured by hingesto the ends of the piston-box, so as to allow ythem to be thrown overthe ends of the piston-box, for holding sand when forming the bell andfaucet ends of the pipe. O is the main shaft, and a a are thecccentrics. L is a screwcam by its side acting on the lever K inrelieving the pattern from the mold, while the sand is retained by thepiston-plate G G. (See plan.) dis a cord passing over a pulley, e, towhich is attached a weight, S,whose use is to keep the lever in contactwith the screwcam. l and 2 are keys for retaining the halfflask to themachine in molding. There is a pawl attached to the spur, to prevent itturning in a wrongdirection.

In the section iny elevation, Fig. 2, the arrangement of the piston,&c., in the box is more clearly exhibited, and in Fig. 3 au enlargedview, exhibiting the caps M M turned over to receive the sand. P l? arerods or bearers supporting the pattern T-'from S S.

U is the gate for pouring in the metal.

The operation is as follows: The caps M M having been turned inposition, (seen in Fig. 3,) the piston,for1ned of the pattern T andpiston-plate G,is lowered in the piston-box. Sand Vis then thrown in,observing to cast it well under the caps M M, and, ridging it up withthe strike, Fig. 4, the surplus sand is removed and the caps thrown backinto position,Fig. l. The half-liask H is now secured by the keys l and2 to the piston-box. Motion having been given by the main shaft O, theeccentrics thereon operate the rods E E, which uplift the piston, formedof the pattern and pistonplate, and with itt-he sand thereon in the box.Continuing the turning of the shaft O the sand is protruded from thepiston-box and forced into the half-flask, and a proper pressure exertedthereon. While under this pressure the screw-cam L and weighted rod Krelieve, the uprights l? I), and the pattern drops below thepiston-plate with a slight side motion, in connection with the verticalone, and is thus relieved from the flask without chipping the edge ofthe mold. The flask is released by the withdrawal of the keys l and 2,and off borne bythe swivels T T. It will be observed that one-half ofthe number of halfflasks have a spur or gate. The others are without it.

This improved machinery enables me to give the desirable firmness ofthesand on the face and parting of the mold,whi1e the central portionthereof preserves the permeable characteristics well understood asrequisite in good founding.

Having described my improvement in machines for forming molds, what Iclaim as my invention, and desire to secure by Letters Patent, is-

The arrangement of the pattern T and piston-plate G Gr, surrounding thepattern, within 2 lLll tral portion of the mold, (as has heretofore beendone,) for the purpose of producing more perfect castings.

a chamber or piston-box, A S, in relation to the half-flask H, operatedon in the manner substantially as described, by which I am e11- abled toprotrude the sand into the ha1f-lask from said piston-box or chamber andaround Vitnesses:

the pattern7 and thus effect a compression of AARON DENMAN, the sand atthe parting, instead of at the celr JOHN C. MOELROY.

D AVID BROVN.

